Version 0.16 uses an older map generation algorithm. If you preferred the terrain generation of that era (specifically regarding ore generation and water), this version will provide that experience.
. While the full game is a paid product, there are legitimate "free" ways to access this specific version. Factorio Forums Official Free Options The Free Demo : You can download a free Factorio demo of version 0.16.51 directly from the official archive Factorio 0.16.51 - Windows- Linux- Mac Free Download